Sea to Summit Frontier Ultralight Collapsible Cup - The Frontier Collapsible Cup is sleek, ultralight and as packable as ever. Building on over a decade of experience in collapsible drinkware, the Frontier Collapsible Cup has been engineered to be sleeker, more ergonomic and lighter. Glass reinforced nylon 66 is used for the base, rim and center ring providing more stability and allowing you to grip the cup more easily. EU food grade silicone rubber sidewalls let the cup shrink down to less than 2cm in height. Features Collapses flat to less than 2cm thick - Frontier Cups fit into your pocket (and fit your lifestyle) Made from BPA-free, food-grade silicone, with nylon rings to maintain shape and shield fingertips from heat Base, rim and center ring made of light-yet-durable glass-reinforced nylon 66 Weighing a mere 54g, this 355ml, space-saving cup takes lightweight functionality to a new level Nests with other Frontier Dinnerware and the 2L Pouring Pot Sea to Summit Guarantee is offered for the Lifetime of this product